Transition probabilities for dipole allowed fine structure transitions in Si-like ions: Si I, S III, Ar V and Ca VII

Abstract

Oscillator strengths and radiative transition probabilities for dipole allowed fine structure levels are obtained for Si-like ions: Si I, S III, Ar V and Ca VII from multiplet line strengths calculated for the Opacity Project and using the observed energy levels. The radiative calculations are carried out in the close-coupling approximation employing the R-matrix method as developed for the Opacity Project. There are relatively little previous data available for the transition probabilities of these ions. Comparisons of the present oscillator strengths with available experimental values exhibit good agreement in general.